How to mount capacitors that are discrete from a circuit board

Thread Starter

Eddy67716

Joined Sep 28, 2020
22
I am going to give my organ's power supply and overhaul soon to extend it's life. For the big electrolyte capacitors, used to smooth the recitied DC current; they were mounted using brackets but the new capacitors are smaller. (would that mean I bought the wrong type) What is the best way to mount them?
 

SamR

Joined Mar 19, 2019
2,933
Sounds like old paper caps with a mounting bracket band around them. The newer same value (or even higher) aluminum can electrolytics are definitely smaller.
 

Delta prime

Joined Nov 15, 2019
621
One pair of 6800uf 40 volt (I bought 50 volt) mounted in series for a 27 volt supply
They're not mounted in series but the 50 volt would be okay
and
One pair of 10000uf 55 volt (I ended up getting 50 volt but I'm trying to make sure they wouldn't damage anything)
You must meet or exceed existing tolerances of the capacitors do not use 50 volts for 55 volt cap.
 

Tonyr1084

Joined Sep 24, 2015
5,570
27VAC rectified and filtered = (27 x 1.414) = 38.18VDC. 40V caps is close but 50V is better.
38VAC rectified and filtered = 53.73VDC. The 50V caps won't do. You'll need bigger. Even caps at 55VDC is too close to the filtered voltage of the power supply. I'd go with at least 60V (if they have them at that voltage) (Higher is better)
 

Tonyr1084

Joined Sep 24, 2015
5,570
If heat is not a concern then Hot Melt Glue (or "HotSnot") should hold them fairly secure. What kind of environment are they in? High heat? Shock and vibration? Exposure to chemicals or other weather elements?

What sort of connections do the caps have? Screw terminals? Leads? Surface mount?
 

SamR

Joined Mar 19, 2019
2,933
Usually, they are left hanging being far less weighty than the old paper ones. May want to put some spaghetti or shrink-wrap tubing on the leads for short circuit protection if needed.
 

Thread Starter

Eddy67716

Joined Sep 28, 2020
22
I have a friend that helps me. He discharges them with a 15 watt 2Kohm resistor. I read the volts with my multimeter to make sure they are discharged.
 
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